How do you know the buyer is not conspiring with the arbitrator, wait for the delivery and subsequently leave with the BTCs?
Even if they implement a feedback system it will require trust.
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Finally, Trent himself has no opportunity to run away with the funds. In theory, Trent can conspire with Alice to split the funds fifty-fifty and leave Bob with nothing, but such a situation would require two of the three parties involved to be dishonest, rather than only one.
This is a risk, but one that can be extremely small if you're using reputable, high-rated, reliable and trustworthy arbitrators that care about their reputation. Its still pretty early, but I'm hoping that the more well-known arbitrators would build a reputation that could allow people to trust them and know they won't do anything fishy.
I think arbitrators should put down an amount of BTC and be limited to escrow for that amount.
Not sure this is the best solution tho
What do you think?
We're planning to add a sort of fidelity bond in the form of verified accounts, but I think that reputation would do a much better job at ensuring the arbitrators are reliable.